Interference filter with minimal angular and thermal dependence
OwnerGhanim Aljumaily, John B. Barton +3inventors
InventorsGhanim Aljumaily, John B. Barton, Gary E. Carver, Sheetal K. Chanda, Sarah A. Locknar
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Abstract
A method includes positioning a substrate at an initial position. The method also includes placing a filter onto the substrate. The filter is configured with a first set of layers with a maximized index and a second set of layers with a maximized index. The index for the first set of layers is greater than the index for the second set of layers. The filter has a reduced/minimal dependence on an angle of incidence (AOI) and reduced/minimal thermal dependence. The filter transmits signal photons onto a photon detector, rejects ambient photons, and increases signal-to-noise ratio of the photon detector.
Claims18
A method comprising:
- positioning a substrate at an initial position;
- placing a filter onto the substrate, wherein the filter is configured with a first set of layers with an index and a second set of layers with an index, wherein the index for the first set of layers is greater than the index for the second set of layers, wherein the filter has a reduced/minimal dependence on an angle of incidence (AOI), and reduced/minimal thermal dependence, wherein the filter detects signal photons, rejects ambient photons, and increases a signal-to noise ratio, wherein a temperature decrease increases compression of the filter to increase a thickness of the layers;
- and
- transmitting a filtered signal by the filter onto a photon detector.
A method comprising:
- positioning a substrate at an initial position;
- configuring a filter with a plurality of layers onto the substrate, wherein the plurality of layers have an index, wherein one set of the plurality of layers have a greater index than another set of the layers, wherein the filter has a minimal dependence on an angle of incidence (AOI) and a minimal thermal dependence, wherein the filter is configured to detect signal photons and reject ambient photons and increase a signal to noise ratio;
- increasing optical thickness in the filter with reduced temperature and decreasing the optical thickness in the filter with increased temperature to provide the reduced thermal dependence;
- and
- transmitting a filtered signal from the filter toward one or more electronic devices.
A system comprising:
- a substrate positioned at an initial position;
- a filter configured onto the substrate, wherein the filter is configured with a first set of layers with an index and a second set of layers with an index, wherein the index for the first set of layers is greater than the index for the second set of layers, wherein the filter has a reduced/minimal dependence on an angle of incidence (AOI), and reduced/minimal thermal dependence, wherein the filter detects signal photons, rejects ambient photons, and increases a signal-to noise ratio, and wherein a temperature decrease increases compression of the filter to increase a thickness of the layers;
- and
- a photon detector that receives a filter signal from the filter.
Dependencies are inferred from the claim text.